Support RHEL7 in RPM pacakge

- installs the code to library path both for python 2.6 and 2.7

Implements: MN-2970

Change-Id: Iecf2a8d0b485919e387ad80781e688c71c0337c0
(cherry picked from commit 80d97b735facbb614b5145a7a0da474f4ea80f69)